This document discusses functions in Python. It defines a function as a block of reusable code that has a name. The function header includes the name, parameters in parentheses, and return type. The function body contains the code within curly braces. Functions are called by their name and parameters are passed within parentheses. Examples are provided of defining, calling, and returning values from functions in Python.

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3. FUNCTIONS IN PYTHON
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4. What is a Function?
A function is a block of code that has a name and it
has a property that it is reusable
i.e. it can be executed from as many different points
in Program as required
Structure of a Function
There are two main parts of the function.
i.e:The function header and the function body.
int sum(int x,int y)
{
Int a=0;
a=x+y;
return a
}

5. Function Header:
{
Int a=0;
a=x+y;
return a
}
It has three main parts
The name of the function i.e. sum
The parameters of the function enclosed in
paranthesis
Return value type
Eg:int sum(int x,int y)
Function Body:
What ever is written with in { } in the above
example is the body of the function.
Function Call:
Function is called by function name
i.e:Here,for eg:
sum(1,2);

6. FUNCTION IN PYTHON:
Defining a Function
Function blocks begin with the keyword def followed by the function
name and parentheses ( ( ) ).
Any input parameters or arguments should be placed within these
parentheses. You can also define parameters inside these parentheses.
The first statement of a function can be an optional statement - the
documentation string of the function or docstring.
The code block within every function starts with a colon (:) and is
indented.
The statement return [expression] exits a function, optionally passing
back an expression to the caller.
A return statement with no arguments is the same as return None.

7. Syntax:
def functionname( parameters ): "function_docstring" function_suite return [expression]def functionname( parameters ): "function_docstring" function_suite return [expression]
def functionname (parameters):
“function docstring”
function_suite
return [expression]
def functionname( parameters ):
By default, parameters have a positional behavior, and you need
to inform them in the same order that they were defined.
Example:
def printme(str):
“this prints the passed strings into this function”
print str
return
Calling a Function:
we can execute it by calling it from another function or directly from the Python prompt
For above example,function can be called as printme(“hai friends!”)
 output: hai friends!

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